Robust collaborative relay beamforming design for two-way relay systems with reciprocal CSI

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• 作者：Yi Wang ; Baofeng Ji ; Yongming Huang ; Tian Ban ; Luxi Yang
• 关键词：Two ; way relay ; Reciprocal CSI ; Robust collaborative beamforming ; Stochastic error model ; Weighted sum mean squared error
• 刊名：Wireless Networks
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：21
• 期：7
• 页码：2209-2221
• 全文大小：1,075 KB
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• 作者单位：Yi Wang (1)
  Baofeng Ji (2) (3)
  Yongming Huang (1)
  Tian Ban (4)
  Luxi Yang (1)
  
  1. School of Information Science and Engineering, Southeast University, Nanjing, 210096, China
  2. Electronic and Information Engineering College, Henan University of Science and Technology, Luoyang, 471003, China
  3. State Key Laboratory of Millimeter Waves, Southeast University, Nanjing, 210096, China
  4. School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China
  
• 刊物类别：Computer Science
• 刊物主题：Computer Communication Networks
  Electronic and Computer Engineering
  Business Information Systems
  
• 出版者：Springer Netherlands
• ISSN：1572-8196

文摘

In this paper, we propose a robust collaborative relay beamforming scheme in the presence of imperfect channel state information (CSI) for a multiple single-antenna two-way relays network with reciprocal channels. Many existing beamforming schemes have been investigated using perfect CSI for relay-aided systems. However, in practical communication systems the channel estimation is always inaccurate at relay nodes, leading to the deviation between the true CSI and the estimated CSI. Aiming to tackle the performance degradation caused by the CSI mismatch, a constrained optimization problem corresponding to the robust relay beamforming vector is formulated, in which the channel estimation error is characterized by the stochastic error model. Herein the commonly used performance metric, expected weighted sum mean squared error, is adopted as design objective to evaluate the overall link reliability. It is found that due to the intractable expression of the cost function, we can not resort to the traditional methods for solving the involved optimization problem. Whereas, by exploring the lower bound of the cost function using Jensen’s inequality and the Taylor series expansion, the original optimization problem is recast to a convex optimization in the form of Rayleigh–Ritz ratio, which results in a closed-form robust relay beamforming solution. Numerical results verify the robustness and superiority of the proposed scheme against CSI errors in terms of system sum rate and average BER. Keywords Two-way relay Reciprocal CSI Robust collaborative beamforming Stochastic error model Weighted sum mean squared error